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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f230820d2a73ec9c6b6c05ccf9ec986a8baf548661853ed302ae2aea48ff62' 
  AND token = 'If/36XJp0GeFRxZChWwbOwL6lil2ZQyASt7Dzzf37Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}